Indian Cherokee

I looked up my family history and my mother told me that my great grandmother was a full-blood cherokee indian. And i am wondering how much of an cherokee I am. I am also African american as well.

If your Great grandmother was Cherokee, your grandparent was 1/2, your mother or father was 1/4 and you are 1/8. That is unless there is more Native American on other sides of your family, then it would increase.